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 * modification, are permitted provided that the following conditions
 * are met:
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 *   * Redistributions in binary form must reproduce the above copyright
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 *     the documentation and/or other materials provided with the
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 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
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 */

#ifndef SGXECDSAATTESTATION_JSONPARSER_H
#define SGXECDSAATTESTATION_JSONPARSER_H

#include <rapidjson/fwd.h>
#include <rapidjson/document.h>

#include <string>
#include <vector>
#include <ctime>

namespace intel { namespace sgx { namespace dcap {

class JsonParser
{
public:
    enum ParseStatus {
        OK,
        Missing,
        Invalid
    };

    bool parse(const std::string& json);
    const rapidjson::Value* getRoot() const;
    const rapidjson::Value* getField(const std::string& fieldName) const;
    std::pair<std::vector<uint8_t>, ParseStatus> getHexstringFieldOf(const ::rapidjson::Value& parent, const std::string& fieldName, size_t length) const;
    std::pair<std::string, ParseStatus> getStringFieldOf(const ::rapidjson::Value &parent, const std::string &fieldName) const;
    std::pair<tm, ParseStatus> getDateFieldOf(const ::rapidjson::Value& parent, const std::string& fieldName) const;
    JsonParser::ParseStatus checkDateFieldOf(const ::rapidjson::Value& parent, const std::string& fieldName) const;
    std::pair<uint32_t, ParseStatus> getUintFieldOf(const ::rapidjson::Value& parent, const std::string& fieldName) const;
    std::pair<int, ParseStatus> getIntFieldOf(const ::rapidjson::Value& parent, const std::string& fieldName) const;

private:
    bool isValidHexstring(const std::string& hexString) const;

    rapidjson::Document jsonDocument;
};

}}} // namespace intel { namespace sgx { namespace dcap {


#endif //SGXECDSAATTESTATION_JSONPARSER_H
